ANOVA of the quadratic model of the extraction yields of aloe-emodin, rhein, emodin, chrysophanol, physcion and total anthraquinones.

Source	Aloe-emodin		Rhein		Emodin		Chrysophanol		Physcion		Total anthraquinones
	F-value	P a > F	F-value	P a > F	F-value	P a > F	F-value	P a > F	F-value	P a > F	F-value	P a > F
Model	1.25	0.394	1.21	0.412	10.36	0.003	13.52	0.001	9.25	0.004	645.15	0.001
A	0.60	0.465	0.0091	0.927	4.94	0.062	0.0004	0.984	0.81	0.398	58.16	0.001
B	0.19	0.676	0.21	0.658	4.89	0.063	3.50	0.104	9.28	0.019	247.17	0.001
C	0.94	0.364	1.48	0.264	4.43	0.073	0.99	0.353	0.041	0.845	96.12	0.001
AB	0.18	0.687	0.0014	0.971	11.84	0.011	4.40	0.074	0.33	0.585	45.39	0.001
AC	0.91	0.373	0.33	0.581	1.43	0.270	0.48	0.513	7.63	0.028	15.54	0.006
BC	0.0008	0.978	0.044	0.840	0.081	0.784	0.021	0.890	5.99	0.044	53.51	0.001
A 2	1.75	0.228	1.08	0.334	4.39	0.074	28.05	0.001	25.13	0.002	1490.66	0.001
B 2	3.93	0.088	2.41	0.164	26.84	0.001	28.36	0.001	21.45	0.002	1753.33	0.001
C 2	1.90	0.210	4.44	0.073	28.45	0.001	44.25	0.000	6.86	0.034	1490.66	0.001
Lack of fit	0.88	0.522	25.71	0.005	20.84	0.007	2.99	0.159	6.74	0.048	0.59	0.654
R 2	0.6161		0.6077		0.9301		0.9456		0.9224		0.9988

^aProbability values (P-values).